Alex,

Have a question:

Does or can the DCA mechanism copy small and even tiny packets 
during low-level 'igb' device processing?  Can IOAT/DCA become 
involved in moving small packets from the kernel to user-space?  
For UDP as well as TCP?

The reason why we're so interested in the latest 82575 and 82576 
chips is the performance improvement potential.  We deal with 
extremely high volumes of 100-200 byte multicast UDP packets 
which as far as I can tell has not been a major focus for the 
new DMA controller functionality.  My hope is that the second 
generation of IOAT that includes cache coherent transfers can at 
some point be applied to our data mix.  Large packet off-loading 
does not help in the slightest.

Thanks,

David


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